logger.go
2.35 KB
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package log
import (
"fmt"
log "code.google.com/p/log4go"
)
var root log.Logger = make(log.Logger)
func LogTo(target string, level_name string) {
var writer log.LogWriter = nil
switch target {
case "stdout":
writer = log.NewConsoleLogWriter()
case "none":
// no logging
default:
writer = log.NewFileLogWriter(target, true)
}
if writer != nil {
var level = log.DEBUG
switch level_name {
case "FINEST":
level = log.FINEST
case "FINE":
level = log.FINE
case "DEBUG":
level = log.DEBUG
case "TRACE":
level = log.TRACE
case "INFO":
level = log.INFO
case "WARNING":
level = log.WARNING
case "ERROR":
level = log.ERROR
case "CRITICAL":
level = log.CRITICAL
default:
level = log.INFO
}
root.AddFilter("log", level, writer)
}
}
type Logger interface {
AddLogPrefix(string)
ClearLogPrefixes()
Debug(string, ...interface{})
Info(string, ...interface{})
Warn(string, ...interface{}) error
Error(string, ...interface{}) error
}
type PrefixLogger struct {
*log.Logger
prefix string
}
func NewPrefixLogger(prefixes ...string) Logger {
logger := &PrefixLogger{Logger: &root}
for _, p := range prefixes {
logger.AddLogPrefix(p)
}
return logger
}
func (pl *PrefixLogger) pfx(fmtstr string) interface{} {
return fmt.Sprintf("%s %s", pl.prefix, fmtstr)
}
func (pl *PrefixLogger) Debug(arg0 string, args ...interface{}) {
pl.Logger.Debug(pl.pfx(arg0), args...)
}
func (pl *PrefixLogger) Info(arg0 string, args ...interface{}) {
pl.Logger.Info(pl.pfx(arg0), args...)
}
func (pl *PrefixLogger) Warn(arg0 string, args ...interface{}) error {
return pl.Logger.Warn(pl.pfx(arg0), args...)
}
func (pl *PrefixLogger) Error(arg0 string, args ...interface{}) error {
return pl.Logger.Error(pl.pfx(arg0), args...)
}
func (pl *PrefixLogger) AddLogPrefix(prefix string) {
if len(pl.prefix) > 0 {
pl.prefix += " "
}
pl.prefix += "[" + prefix + "]"
}
func (pl *PrefixLogger) ClearLogPrefixes() {
pl.prefix = ""
}
// we should never really use these . . . always prefer logging through a prefix logger
func Debug(arg0 string, args ...interface{}) {
root.Debug(arg0, args...)
}
func Info(arg0 string, args ...interface{}) {
root.Info(arg0, args...)
}
func Warn(arg0 string, args ...interface{}) error {
return root.Warn(arg0, args...)
}
func Error(arg0 string, args ...interface{}) error {
return root.Error(arg0, args...)
}